Ok so yeah the question was posed by someone and then stated you have to be a gold member .. So where is the setting since that part of the question never got answered?
Go to "My Profile" Then go to "edit my profile" in the top right corner Then go to "Profile Customization" and select the file you want to upload.
Only Editor, having a current subscription or being STAFF will work. Developer isn't given membership but for hard work and dedication you bois do for XPG.. It should be ;P But yeah man it's a really good question though.